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Two cells a and B of emf 1.3 V amd 1.5V ...

Two cells `a` and `B` of emf `1.3 V` amd `1.5V `respectively are arranged as shown in figure. The voltmeter reds `1.45V`. The voltmeter is assumed to be ideal. Then

A

`r_A = 2r_B`

B

`r_A = 3r_B`

C

`r_B= 2r_A`

D

`r_B = 3r_A`

Text Solution

Verified by Experts

The correct Answer is:
B
b. `1.45 = 1.3 + Ir_A`
`1.45 = 1.5 - Ir_B`
`Ir_B = 0.05`
`Ir_A = 0.15`
Dividing, we get `r_B/r_A = 1/3`
or `r_A = 3r_B` .
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